aqueduct of Sylvius
mesencephalic duct

"It's at the lower edge of the aqueduct of Sylvius.

It is near the aqueduct of Sylvius.

Duret lesion - small hemorrhage(s) in the floor of the fourth ventricle or beneath the aqueduct of Sylvius.

Throughout embryonic development, the cells within the midbrain continually multiply and compress the still-forming Aqueduct of Sylvius or cerebral aqueduct.

The fourth ventricle extends from the cerebral aqueduct (aqueduct of Sylvius) to the obex, and is filled with cerebrospinal fluid (CSF).

His discoveries on the anatomy of the brain were very important, some of which took its name from him (the aqueduct of Sylvius, the fissure of Sylvius and the middle cerebral artery).

The aqueduct of Sylvius, normally narrow to begin with, may be obstructed by a number of genetically or acquired lesions (e.g., atresia, ependymitis, hemorrhage, tumor) and lead to dilation of both lateral ventricles as well as the third ventricle.

In reference to bobble-head doll syndrome, a third ventricular cystic lesion causes an obstruction in the foramina of Monro, which communicates with the lateral ventricles, and the proximal, cerebral aqueduct of Sylvius, which communicates with the fourth ventricle.

Specifically, the duct originates from the portion of the neural tube that is present in the developing mesencephalon, hence the name "mesencephalic duct."

The tectum, pretectum, cerebral peduncle and other structures develop out of the mesencephalon, and its cavity grows into the mesencephalic duct (cerebral aqueduct).